EUVD-2026-18884
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
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Description
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, the RSS notifier allows .. path traversal in notify-recipient-uri (e.g., rss:///../job.cache), letting a remote IPP client write RSS XML bytes outside CacheDir/rss (anywhere that is lp-writable). In particular, because CacheDir is group-writable by default (typically root:lp and mode 0770), the notifier (running as lp) can replace root-managed state files via temp-file + rename(). This PoC clobbers CacheDir/job.cache with RSS XML, and after restarting cupsd the scheduler fails to parse the job cache and previously queued jobs disappear. At time of publication, there are no publicly available patches.
Analysis
Path traversal in OpenPrinting CUPS RSS notifier (versions 2.4.16 and prior) allows unauthenticated remote IPP clients to write arbitrary files outside the intended CacheDir/rss directory via a crafted notify-recipient-uri parameter. By exploiting default group-writable permissions on CacheDir, attackers can overwrite critical state files such as job.cache, causing the CUPS scheduler to fail parsing job queues and resulting in loss of previously queued print jobs. …
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